177
MC97F60128
ABOV Semiconductor Co., Ltd.
11.7.2 8-Bit Timer/Counter 7/8 Mode
The 8-bit timer/counter mode is selected by control register as shown in Figure 11.23.
The two 8-bit timers have each counter and data register. The counter register is increased by internal or external
clock input.
Timer 7 can use the input clock with one of 2, 4, 8, 32, 128, 512, 2048 and EC7 prescaler division rates
(T7CK[2:0]). Timer 8 can use the input clock with one of 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192,
16384 and timer 7 clock prescaler division rates (T8CK[3:0]). When the value of T7CNT, T8CNT and T7DR, T8DR are
respectively identical in Timer 7/8, the interrupt Timer 7/8 occurs.
The external clock (EC7) counts up the timer at the rising edge. If the EC7 is selected as a clock source by T7CK[2:0],
EC7 port should be set to the input port by P63IO bit. Timer 8 can
’t use the external EC7 clock.
T7EN
T7CR
1
ADDRESS : 4090H (XSFR)
INITIAL VALUE
: 0000_ 0000B
T7IE
T7MS
T7CK2
T7CK1
T7CK0
T7CN
T7ST
X
0
X
X
X
X
X
16BIT
T8CR
0
INITIAL VALUE
: 0000_ 0000B
T8MS
T8CN
T8ST
T8CK3
T8CK2
T8CK1
T8CK0
0
X
X
X
X
X
X
P
r
e
s
c
a
l
e
r
fx
M
U
X
fx/2
T7 CNT (8Bit)
EC7
fx/4
fx/8
fx/32
fx/ 128
fx/ 512
fx/ 2048
3
T7CK[2:0]
T7CN
8- bit Timer 7 Counter
T7 DR (8Bit)
Comparator
T7IFR
T7O
8- bit Timer 7 Data Register
S/W
Clear
Clear
Match
T7ST
T8 CNT (8Bit)
4
T8CK[3:0]
8- bit Timer 8 Counter
T8 DR (8Bit)
Comparator
To interrupt
block
T8O
8- bit Timer 8 Data Register
Clear
Match
T8ST
P
r
e
s
c
a
l
e
r
fx
M
U
X
fx/1
fx/2
fx/4
fx/8
fx/ 16384
T8CN
To interrupt
block
T7IE
ADDRESS : 4092H (XSFR)
NOTE)
1. Do not set to
“1111b” in the T8CK[3:0], when two 8-bit timer 7/8 modes.
2. Do not set to
“0000b” in the T8CK[3:0], when fx is over 10MHz.
Figure 11.23
8-Bit Timer/Counter Mode for Timer 7/8
Содержание MC97F60128
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